Jupiter August 31st in good seeing+Io transit+ Wesley Imapct+ long hi res animation
Hi All,
Had a most interesting imaging session last night August 31st. For some reason I thought that the Wesley Impact remnant would be at the CM at about 8pm CST so I was all setup with my DMK running by 7:30pm, there was a fair bit of cloud around but I had been monitoring the path of the jet stream and the position of the high pressure system that would get to Broken Hill later in the night, so wasn’t worried about the cloud.
After firing up Jupiter2 I realized that the longitude I was interested in would not be at the central meridian until about 1am. I started capturing R, G & B avi’s with the intent of doing a set every 20 degrees of longitude, the cloud got progressively thicker, which was a shame as when a hole came along the seeing was not bad, about 5 to 6 / 10.
At 8:30pm the cloud closed right in, although occasionally I could still see Jupiter on my laptop screen. Just after 10pm the cloud rapidly cleared, just as quickly as it had set in and the seeing was good 7 to 8 / 10 and it stayed like that for hours.
At midnight I had to flop my scope on its equatorial mount. I disconnected my imaging setup and checked the collimation of my mirrors, then got back into capturing more data, still at 20 degree longitude CMII intervals. The seeing was very consistent and only started to fall off slightly at about 1.30am. I think this was due more to the fact that my scope was then looking over my next door neighbour’s house, rather than any high level atmospheric disturbance.
Definitely a night to remember. I have posted 8 RGB images plus an animation, representing just over 3 hrs of Jupiters rotation, that includes a transit of the GRS, transit of Io and the Wesley Impact remnant, which is getting very difficult to make out. http://iceinspace.com.au/uploads/20090831JupAnim.gif
These are the ramblings of an abscessed planetary imager.
Thanks for looking at my images.
Regards
Trevor
Wow, that is one set of steady seeing avis processed there Trevor. I was intrigued, by the two dots close together infront of the moon shadow, until the moon moved off to the side of Jupiter revealing itself.
Terrific set of images, Trevor. And Lester is right - those two dots are quite noticeable in the animation especially. Can I ask how long are your individual colour exposures and what frame rate are you using?
Wow, that is one set of steady seeing avis processed there Trevor. I was intrigued, by the two dots close together infront of the moon shadow, until the moon moved off to the side of Jupiter revealing itself.
Good on ya.
Thanks Lester, it was a brilliant night. Those dots aren't dots at all. It is the sphere of Io, however there is some albedo shading on it. The poles are darker than the equatorial region.
Quote:
Originally Posted by Rigel003
Terrific set of images, Trevor. And Lester is right - those two dots are quite noticeable in the animation especially. Can I ask how long are your individual colour exposures and what frame rate are you using?
Thanks Graeme, when I read yours and Lesters comment about the dots I had to have another look to see what these dots were, it is Io but the poles are much darker, I suppose that gives the dot impression.
Each channel was captured for 40 sec's, at 30 fps. Exposures were, red channel 1/30th sec, green 1/38th sec, blue 1/30th sec. Histogram was 250.
Nice sequence, Trevor. Glad the night worked out OK.
Thanks for your comment Eric.
Quote:
Originally Posted by DavidU
Another superb gif animation. Your technique is unreal
Thanks David, always fine tuning the technique however the most important thing is to have stable seeing
Quote:
Originally Posted by Paul Haese
Very nice work Trevor, one frame there is particularly sharp. Well done. Would love some of that seeing here.
Thanks Paul, hopfully the Spring will bring better weather down your way.
Quote:
Originally Posted by javier alves
excelent work trevor, is very notorius the shadow of the satelite galileano and the GMR
saludos y buenos cielos
Thanks Javier, it is always very good to have a moon or shadow in the frame as it makes focusing much easier and I think the shadow looks great.
Quote:
Originally Posted by pelu
Great job!!
May improve a little by aligning the satellite shots and replacing
through a mask in the images that you show us
Thanks Pelu, I did think about processing the image set again, aligning on Io, but I dont know how to use the mask function in Photo Shop. Also my images are being measured by Jupos so I have presented them, as taken with no post alignment of features. As it was the processing took about 16hrs.
Quote:
Originally Posted by iceman
Really nice work Trevor, a hell of a lot of time out at the scope and a lot of time processing!
Very nicely done!
Great animation too.
Thanks Mike, as Pelu has suggested, I probably should have done an alignment on Io. Do you know of any tutorials on how to combine that with the original image, I have Photo Shop CS4?
Quote:
Originally Posted by Dennis
Hi Trevor
Thanks again for an amazing animation and the set of frames that went into it. The image scale, detail and processing are all top notch – well done!
Something that caught my eye was some slight "onion" rings on the animation around the edge of the disk? It seems not to be in the pics though....not sure if this is partly due to the process of the gif creation?
Not technically a criticism, just thought you might like to know.
Something that caught my eye was some slight "onion" rings on the animation around the edge of the disk? It seems not to be in the pics though....not sure if this is partly due to the process of the gif creation?
Not technically a criticism, just thought you might like to know.
Awesome detail as usual,
Well done.
Chris
Thanks Chris, I never noticed the rings in the animation until you mentioned it. The individual images that make up the animation are fine and don't exhibit that artifact. Not sure what is happening there, it seems to have been introduced in the making of the gif.
Quote:
Originally Posted by alphajuno
Great job Trevor. Jupiter is a beautiful planet as you have proven once again!
Thanks Dave, in the southern hemisphere we really do have ring side seats at the moment.
